[simpits-tech] MM5451 LED Driver

[Gene Buckle]

Actually, there is a part made by Maxim/Dallas you can use.  You won't
have to pay Newark their absurd prices.

g.


On Thu, 31 Oct 2002, jay-anna wrote:

> Ok, I found the chips for those who wish to purchase them.  National
> Semiconductor no longer makes these chips as I called DigiKey and they
> stated they were obsolete and had no substitute.  I then did a web
> search and found that Newark Electronics carries these chips made by
> Micrel Semiconductor.  Go to this link:
>
> http://www.newark.com/NewarkWebCommerce/newark/en_US/support/search/sear
> chResults.jsp?_dyncharset=ASCII
> <http://www.newark.com/NewarkWebCommerce/newark/en_US/support/search/sea
> rchResults.jsp?_dyncharset=ASCII&action=0&First=0&QText=mm5451>
> &action=0&First=0&QText=mm5451
>
>
>
> You want the chip labeled MM5451BN as this is the 40 pin DIP package,
> the BV is a 44 pin PLCC package which will work if you want to fiddle
> with that kind of package.  They also make a MM5450 chip, this is the
> serial port version, make sure to get the 5451 as this is the parallel
> port version.  I also purchased some 40 pin DIP sockets ( Newark part
> number 81N9192) so that I can swap out chips if there is ever a problem.
>
>
>
> Jay
>
>
>
>
>
> "Show me a man who cannot be bothered to do the little things, and I
> will show you a man who cannot be trusted to do the big ones."
> --Lawrence Bell, Founder Bell Helicopter
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of jay-anna
> Sent: Thursday, October 31, 2002 1:21 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
>
>
> Outstanding Rob, thanks a bunch.  I am off to try and find these chips.
>
>
>
> Jay
>
>
>
> "Show me a man who cannot be bothered to do the little things, and I
> will show you a man who cannot be trusted to do the big ones."
> --Lawrence Bell, Founder Bell Helicopter
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of Robert Favre
> Sent: Thursday, October 31, 2002 12:16 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
>
>
> Ok..some of your questions are answered in other emails, but I'll try to
> run down the list.
>
>
>
> The circuit is actually independent of Falcon, it's just connected to
> the parallel port of a PC.  The way 'my' software works, is it looks in
> shared memory to get the necessary data, so yes, you can have it running
> on a different PC, as long as you're using something like F4Mirror, and
> the circuit has to be connected to the same PC that's running my
> software.
>
>
>
> The software will support 2 chips for a total of 70 LEDs (each 5451 chip
> supports 35 outputs).  The way I have it written is the first chip uses
> pins 2 and 3 on the parallel port, and a second chip would use pins 5
> and 6.
>
>
>
>  The assignments on the spreadsheet refer to the outputs of the chip
> (not the actual pins)
>
>
>
> I got my chips from Radio Shack online, but that was almost a year ago,
> so I don't know if they're still available there.
>
>
>
> I used a regular ceramic capacitor
>
>
>
> Bought the LEDs at the local Radio Shack (geez.I go there a LOT).the
> lower the voltage and drain the better
>
>
>
> Also.I've uploaded the manufacturer spec sheet to the website
> (mm5451.pdf).it gives all the gory details of how the chip works.
>
>
>
> Any further questions are welcome!!!
>
>
>
> Oh.about the gear lights.there IS a 'data' variable that can be used to
> determine if the gear is up/down or in transit, but it's not a 'light
> bit'.  The light bit is just a on or off indicator for the gearhandle.
>
>
>
> Rob
>
>
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of jay-anna
> Sent: Wednesday, October 30, 2002 5:21 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
>
>
> To Robert or anyone out there, could you give a brief description of how
> this circuit works and will it work on a slave machine networked to a
> main box running Falcon or must it run on a host machine running Falcon?
> Can it run on a slave machine with Falcon mem-reader running?  There are
> 2 chips listed on the spreadsheet, are these two different circuits?  Do
> they need two different parallel ports? Two different computers?   Where
> does one locate these chips?  Digikey? Mouser etc?  The pin assignments
> for the LEDs are not really the pin of the chip, but the listed outs
> 1-35 listed on the circuit?  Are there any resistors that need to be
> used with these LED's?  What voltage LED are the best for this circuit?
> The capacitor, can it be a generic ceramic disc capacitor or does it
> need to be tantalum, electrolytic etc. type?
>
>
>
> I'm not trying to be a butt with all the questions, goodness knows my
> pants are going crazy for the fact that someone knows how to do this and
> is willing to share it with others and now one less thing I have to
> figure out (and would probably have a hard time doing it since I don't
> know anything about programming).
>
>
>
> Thanks
>
> Jay
>
>
>
>
>
> "Show me a man who cannot be bothered to do the little things, and I
> will show you a man who cannot be trusted to do the big ones."
> --Lawrence Bell, Founder Bell Helicopter
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of Robert Favre
> Sent: Tuesday, October 29, 2002 6:14 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
>
>
> No problem Mike.
>
>
>
> Ok.here we go.I've uploaded the program to the ftp server
> (Falcon2_4.zip).  The installation instructions are fairly simple.put
> the vbio.dll file into the \windows\system directory, click on the
> Falcon2_4.exe program to run. I've also included an excel spreadsheet
> that lists which lights are on which pins.  Questions are welcome
>
>
>
> Rob
>
>
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of Mike Williams
> Sent: Tuesday, October 29, 2002 3:23 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
>
>
> Thanks Rob, I may ask your help on this as I move forward, no heavy
> bugging though :)
>
>
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org]On Behalf Of Robert Favre
> Sent: Tuesday, October 29, 2002 5:57 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
> Yup.I'll put together a zip and post to the server.
>
>
>
> Rob
>
>
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of Mike Williams
> Sent: Tuesday, October 29, 2002 1:56 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] MM5451 LED Driver
>
>
>
> Rob,
>
> no idea how to code, maybe I will have to learn some if I must, do you
> already have a program written to for the w/ 5451 to interface w/
>
> Falcon?
>
>
>
> Thanks
>
>  -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org]On Behalf Of Robert Favre
> Sent: Tuesday, October 29, 2002 2:40 PM
> To: simpits-tech@simpits.org
> Subject: [simpits-tech] MM5451 LED Driver
>
> Ok folks.I've uploaded (circuit.jpg) the circuit diagram for the 5451
> LED driver to the ftp site.  In a single chip configuration, the chip
> connects to pins 2,3 and 18 of the parallel printer port.  As always,
> please be careful in working with ports on your PC.  If anyone needs
> help with the code portion, I can only help if you're interested in VB.
> Also, my code requires the use of a 3rd party driver called VBIO (it's
> free, and I believe I have a copy somewhere as well).  When I last
> played with the code, I was running a Win98SE PC, so I haven't tested on
> any other OS.
>
>
>
> Rob
>
>
>
>